Stats Calculator Online
Probability Distributions Calculators
PDF, CDF, and critical values for common distributions. Free tools on Stats Calculator Online with formulas, how-to steps, similar calculator widgets, tidbits, and exportable reports.
- Basic Probability CalculatorUnion, intersection, and conditional probability
- Normal Distribution CalculatorPDF, CDF, and quantiles of the normal
- Student t Distribution CalculatorPDF, CDF, and quantiles of t
- Chi-Square Distribution CalculatorPDF, CDF, and quantiles of chi-square
- F Distribution CalculatorPDF, CDF, and quantiles of F
- Binomial Distribution CalculatorPMF and CDF for binomial trials
- Poisson Distribution CalculatorPMF and CDF for Poisson counts
- Geometric Distribution CalculatorTrials until first success
- Negative Binomial CalculatorTrials until r successes
- Hypergeometric CalculatorSampling without replacement
- Exponential Distribution CalculatorWaiting times with constant hazard
- Gamma Distribution CalculatorShape-scale continuous distribution
- Beta Distribution CalculatorBounded continuous probabilities
- Uniform Distribution CalculatorContinuous uniform PDF/CDF
- Weibull Distribution CalculatorReliability and lifetime modeling
- Log-Normal Distribution CalculatorLog-normal PDF/CDF
- Logistic Distribution CalculatorLogistic PDF/CDF
- Inverse Normal CalculatorFind x given cumulative probability
- Expected Value CalculatorE[X] for discrete or continuous setups
- Random Number Generator CalculatorGenerate random samples from distributions
- Bayes’ Rule CalculatorPosterior probability from prior, sensitivity, specificity
- Multinomial Distribution CalculatorMultinomial PMF for count vectors
- Monte Carlo Simulation CalculatorSimulate draws and optional exceedance probability
Tidbits from Stats Calculator Online
Remember
Correlation is not causation
Pearson r measures linear association. Plot the scatter first, and prefer Spearman when the relationship is monotonic but not linear.
Correlation tools →Tidbit
Read confidence intervals carefully
A 95% CI means that in repeated sampling, about 95% of such intervals would cover the true parameter—not that this one interval has a 95% chance.
CI calculators →Free on every tool
APA write-ups and PDF exports
After you calculate, copy APA/AMA text or download CSV, Word, and print-ready PDF—no paywall on Stats Calculator Online.
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Cross-topic picks from Stats Calculator Online
- One-Sample t-Test CalculatorHypothesis Testing · Test a sample mean against a hypothesized value
- Mean, Median, Mode CalculatorDescriptive Statistics · Calculate arithmetic mean, median, and mode
- Simple Linear Regression CalculatorRegression Analysis · Fit y = a + bx with inference
- Chi-Square Independence CalculatorHypothesis Testing · Test association in contingency tables
- Sample Size & Power CalculatorHypothesis Testing · Plan sample size for desired power